تقرير
Ab-intio study of ultrafast charge dynamics in graphene
العنوان: | Ab-intio study of ultrafast charge dynamics in graphene |
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المؤلفون: | Li, Q. Z., Elliott, P., Dewhurst, J. K., Sharma, S., Shallcross, S. |
المصدر: | Phys. Rev. B 103, 081102 (2021) |
سنة النشر: | 2020 |
المجموعة: | Condensed Matter Quantum Physics |
مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, Condensed Matter - Other Condensed Matter, Quantum Physics |
الوصف: | Monolayer graphene provides an ideal material to explore one of the fundamental light-field driven interference effects: Landau-Zener-St\"uckelberg interference. However, direct observation of the resulting interference patterns in momentum space has not proven possible, with Landau-Zener-St\"uckelberg interference observed only indirectly through optically induced residual currents. Here we show that the transient electron momentum density (EMD), an object that can easily be obtained in experiment, provides an excellent description of momentum resolved charge excitation. We employ state-of-the-art time-dependent density function theory calculations, demonstrating by direct comparison of EMD with conduction band occupancy, obtained from projecting the time propagated wavefunction onto the ground state, that the two quantities are in excellent agreement. For even the most intense laser pulses we find that the electron dynamics to be almost completely dominated by the $\pi$-band, with transitions to other bands strongly suppressed. Simple model based tight-binding approaches can thus be expected to provide an excellent description for the laser induced electron dynamics in graphene. |
نوع الوثيقة: | Working Paper |
DOI: | 10.1103/PhysRevB.103.L081102 |
URL الوصول: | http://arxiv.org/abs/2012.00435 |
رقم الأكسشن: | edsarx.2012.00435 |
قاعدة البيانات: | arXiv |
DOI: | 10.1103/PhysRevB.103.L081102 |
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